gwm rotary ph conv ?

Yes -- other than lacking a visible means to start the motor which serves as an idler. (There may be a way buried in there which you can't see, which connects between one of the input lines and the third line -- sometimes just a passive capacitance, and sometimes with a voltage-sensing relay to disconnect start capacitors once it is up to speed.)

Ideally -- there should also be capacitors to balance the voltages and currents, but you can usually do without those, at the cost of more (reactive) current -- it won't spin your power meter any faster, but it might trip circuit breakers more often than you would like.

Good Luck, DoN.